[issue9115] test_site: support for systems without unsetenv

[Zsolt Cserna]

New submission from Zsolt Cserna <zsolt.cserna at morganstanley.com>:

On systems where there's no unsetenv function (for example solaris 8), test_site fails because the PYTHONUSERBASE environment variable remains set to "xoxo" (set in the previous tests).

This results a failed test_s_option test.

----------
components: Tests
files: test_site.py.diff
keywords: patch
messages: 108910
nosy: csernazs
priority: normal
severity: normal
status: open
title: test_site: support for systems without unsetenv
type: behavior
versions: Python 2.7
Added file: http://bugs.python.org/file17799/test_site.py.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9115>
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